Remastersys is a tool that can be used to make ubuntu livecd and also it can make a full system backup including personal data to a live cd or dvd that you can use anywhere and and it can install at any time. It can make your own distributable copy with all the softwares installed in your system (eg:java,flashplayer, codecs, fonts, mysql, apache, php etc) can share with your friends. This will not have any of your personal user data in it.
Add the following line to your /etc/apt/sources.list
$ deb http://www.remastersys.klikit-linux.com/repository remastersys/
$ sudo apt-get update
$ sudo apt-get install remastersys
run remastersys-gui and make your live cd